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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script  type="text/javascript" src="../js/class5-28.js"></script>
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<body>
    请输入第一个数:<input type="text" id="num1"><br>
    请输入第二个数:<input type="text" id="num2"><br>
    <input type="button" value="+" onclick="jieguo1()"><br>
    <input type="button" value="-" onclick="jieguo2()"><br>
    <input type="button" value="*" onclick="jieguo3()"><br>
    <input type="button" value="/" onclick="jieguo4()"><br>
    结果:<input type="text" id="result">
</body>
</html>